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Fix GH-20076: open_basedir prohibits opening :memory:?cache=shared #20080

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Fix GH-20076: open_basedir prohibits opening :memory:?cache=shared #20080

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2 changes: 1 addition & 1 deletion ext/pdo_sqlite/sqlite_driver.c
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Original file line number Diff line number Diff line change
Expand Up @@ -737,7 +737,7 @@ static char *make_filename_safe(const char *filename)
}
return estrdup(filename);
}
if (*filename && strcmp(filename, ":memory:")) {
if (*filename && strncmp(filename, ":memory:", sizeof(":memory:")-1) != 0) {
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Is this 100% safe and wouldn't be something like :memory:/path processed like regular filepath?

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It seems this is not only theoretical, but also the real reason why the CI is failing - a file (instead of in-memory DB) is created.

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The official condition is in https://github.com/sqlite/sqlite/blob/version-3.50.4/src/btree.c#L2552.

I even wonder what is :memory:?cache=shared, I did not find any testcase for it in Sqlite codebase.

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@AnrDaemon AnrDaemon Oct 8, 2025 •
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The "cache" connection parameter lets you specify the "shared key" to connect to in-memory database created in a different process.
Ref: https://www.sqlite.org/inmemorydb.html#sharedmemdb

The value could be anything, on production we're using UUID generated at deploy time.

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The reason why this does not work is in https://www.sqlite.org/sharedcache.html#shared_cache_and_in_memory_databases.

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The interesting point is that it works on Linux (tested multiple times)

PHP Version 8.4.5
Linux 1bb44a69f3cb 4.18.0-553.el8_10.x86_64 #1 SMP Fri May 24 13:05:10 UTC 2024 x86_64
PDO Driver for SQLite 3.x enabled
SQLite Library 3.48.0

char *fullpath = expand_filepath(filename, NULL);

if (!fullpath) {
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13 changes: 13 additions & 0 deletions ext/pdo_sqlite/tests/gh20076.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
--TEST--
GH-20076 (open_basedir prohibits opening :memory:?cache=shared)
--EXTENSIONS--
sqlite3
--INI--
open_basedir=xx
--FILE--
<?php
var_dump(new PDO("sqlite::memory:?cache=shared"));
?>
--EXPECT--
object(PDO)#1 (0) {
}
4 changes: 2 additions & 2 deletions ext/sqlite3/sqlite3.c
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Expand Up @@ -113,7 +113,7 @@ PHP_METHOD(SQLite3, open)
RETURN_THROWS();
}

if (filename_len != 0 && (filename_len != sizeof(":memory:")-1 ||
if (filename_len != 0 && (filename_len < sizeof(":memory:")-1 ||
memcmp(filename, ":memory:", sizeof(":memory:")-1) != 0)) {
if (!(fullpath = expand_filepath(filename, NULL))) {
zend_throw_exception(zend_ce_exception, "Unable to expand filepath", 0);
Expand All @@ -126,7 +126,7 @@ PHP_METHOD(SQLite3, open)
RETURN_THROWS();
}
} else {
/* filename equals "" or ":memory:" */
/* filename equals "" or starts with ":memory:" */
fullpath = filename;
}

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13 changes: 13 additions & 0 deletions ext/sqlite3/tests/gh20076.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
--TEST--
GH-20076 (open_basedir prohibits opening :memory:?cache=shared)
--EXTENSIONS--
sqlite3
--INI--
open_basedir=xx
--FILE--
<?php
var_dump(new SQLite3(":memory:?cache=shared"));
?>
--EXPECT--
object(SQLite3)#1 (0) {
}
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